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2-7
FUEL INJECTION SYSTEM
TROUBLESHOOTING
General Troubleshooting Table
*: The CHECK ENGINE light blinks.
*1: The CHECK ENGINE light blinks when contact is resumed during inspection (although poor contact is present in the 0-
check).
*2: The CHECK ENGINE light lights when the mixture is leaner than that specified and does not light (U-check) or blink (0-
check) when the mixture is richer.
*3: The CHECK ENGINE light lights when abnormality is detected in the D-check mode if the idle switch persistently remains
off with the acclerator pedal released.
Symbols shown in the table refer to the
TROUBLE
degree of possibility of the reason for
1
No initial combustion
the trouble ("Very often" to "Rarely").
-
Engine will
© : Very often
2
Initial combustion occurs.
-
not start
o :
Sometimes
3
Engine stalls after initial combustion.
6:
Rarely
4
Rough idle and engine stall
u:
Occurs only in extremely
low temperatures
5
Inability to drive at constant speed
6
Inability to accelerate and decelerate
7
Engine does not return to idle.
8
Afterburning in exhaust system
9
Knocking
%§
10
Excessive fuel consumption
11
U
CHECK EN-
U-check mode
&
read memory mode
r - -
GINE light
D
operation
D-check mode
TROUBLE No.
#
POSSIBLE CAUSE
1
2
3
4
5
6
7
8
9
10
U
D
AIR FLOW METER
U
©
6
6
0
ON
ON
•
Connector not connected
6
© © ©
©
0
6
ON
*1
•
Poor contact of terminal
U
©
6
0
6
ON
ON
•
Short circuit
U
©
6
6
0
ON
ON
•
Discontinuity of wiring harness
0
0
0
0
6
©
0
*2
*2
•
Performance characteristics unusual
COOLANT THERMOSENSOR
U
0
U
0
0
0
0
ON
ON
•
Connector not connected
6
6
©
0
0
©
6
0
ON
*1
•
Poor contact of terminal
U
0
U
0
0
0
0
ON
ON
•
Short circuit
U
0
U
0
0
0
0
ON
ON
•
Discontinuity of wiring harness
U
0
U
0
© © ©
*2
*2
•
Performance characteristics unusual
IDLE SWITCH OF THROTTLE SENSOR
0
©
©
OFF ON
•
Connector not connected
0
0
ON
*1
•
Poor contact of terminal
0
6
0
ON
ON
•
Short circuit
6,
0
OFF
ON
•
Discontinuity of wiring harness
0
OFF
*3
•
Improper adjustment
1
2
3
4
5
6
7
8
9
10
U
D
#:
CHECK ENGINE light
30
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